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tapwater
England and Wales average 9.0

Tap water in S42, North East DerbyshireSafe to drink.Moderately soft.

Supplied by Severn Trent. 1,095 samples, 20 substances, latest on 18 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.1 / 10

The tank is as full as the score. The specks are the minerals that make water hard.

What to do about it

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Households concerned about PFAS and heavy metals

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High-volume under-sink filtration without RO complexity

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Basic chlorine and taste improvement on a budget

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What's in a glass of S42 water

Every bubble is a substance the lab measured. The higher it floats, the closer it came to its legal limit, the dashed line at the top.

Trihalomethanes came closest to a limit, at 35% of it. 14 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitNitrite: 0.003 mg/L, <1% of the 0.5 mg/L limitNitrite<1%Chromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Selenium: 0.00037 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Cadmium: 0.00007 mg/L, 1% of the 0.005 mg/L limitCadmium1%Manganese: 0.00073 mg/L, 1% of the 0.05 mg/L limitManganese1%Arsenic: 0.0002 mg/L, 2% of the 0.01 mg/L limitArsenic2%Lead: 0.00028 mg/L, 3% of the 0.01 mg/L limitLead3%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%Antimony: 0.000219 mg/L, 4% of the 0.005 mg/L limitAntimony4%Iron: 0.0109 mg/L, 5% of the 0.2 mg/L limitIron5%Copper: 0.163 mg/L, 8% of the 2 mg/L limitCopper8%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Nitrate: 5.8 mg/L, 12% of the 50 mg/L limitNitrate12%Fluoride: 0.41 mg/L, 27% of the 1.5 mg/L limitFluoride27%Nickel: 0.0055 mg/L, 27% of the 0.02 mg/L limitNickel27%Trihalomethanes: 0.0353 mg/L, 35% of the 0.1 mg/L limitTrihalomethanes35%
  1. Trihalomethanes35%
  2. Nickel27%
  3. Fluoride27%
  4. Nitrate12%
  5. Aluminium11%
  6. Copper8%
  7. Iron5%
  8. Antimony4%
  9. Colour4%
  10. Turbidity3%
  11. Lead3%
  12. Arsenic2%
  13. Manganese1%
  14. Cadmium1%
  15. Selenium<1%
  16. Chromium<1%
  17. Nitrite<1%
  • pH 7.51 pH
  • Conductivity 301 µS/cm
  • Phosphate 0.993 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
pH7.51 pHNo legal limit–
Turbidity0.12 NTU4 NTU
3%
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Manganese0.00073 mg/L0.05 mg/L
1%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0109 mg/L0.2 mg/L
5%
Conductivity301 µS/cmNo legal limit–
Copper0.163 mg/L2 mg/L
8%
Fluoride0.41 mg/L1.5 mg/L
27%
Arsenic0.0002 mg/L0.01 mg/L
2%
Cadmium0.00007 mg/L0.005 mg/L
1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0055 mg/L0.02 mg/L
27%
Lead0.00028 mg/L0.01 mg/L
3%
Antimony0.000219 mg/L0.005 mg/L
4%
Selenium0.00037 mg/L0.04 mg/L
<1%
Nitrate5.8 mg/L50 mg/L
12%
Nitrite0.003 mg/L0.5 mg/L
<1%
Trihalomethanes0.0353 mg/L0.1 mg/L
35%
Phosphate0.993 mg/LNo legal limit–

88mg of limescale minerals in every litre, typical for the S area. S42 has no reading of its own.

Soft water. Kind to kettles, boilers and skin

You will not need a softener here, and you will use less soap and detergent than most of England.

Soft400 mg/L
Outside your tap

Your river is the Redleadmill Brook, rated moderate

The Environment Agency rated the Redleadmill Brook as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae and phosphate. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants.

None of this is a test of your tap water. Environment Agency record · River health across England

S42 in short

Tap water in S42 (North East Derbyshire) is supplied by Severn Trent in the North East Derbyshire Central zone and scores 9.1 out of 10, against an England and Wales average of 9.0. None of the 20 tested substances came close to a limit. The latest sample is from 18 December 2025.

  • 3rd cleanest of 4 areas tested in North East Derbyshire1 area in North East Derbyshire scored lower. The best is S18 on 9.4.
  • Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 35% of the 0.1 mg/L maximum. See every reading
  • Moderately soft water at 88 mg/LLittle limescale to speak of across the S postcode area. A softener would be money wasted. How hardness is measured

Next door

S189.4 out of 10 · 88 mg/LS219.2 out of 10 · 88 mg/LS459.1 out of 10 · 88 mg/LS407.1 out of 10 · 88 mg/LS417.1 out of 10 · 88 mg/L

Questions about S42 water

Is S42 tap water safe to drink?

Based on the latest tests, S42 (North East Derbyshire) water scores 9.1/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in S42 water?

We tested 20 contaminants in S42 water. None exceeded recommended safe levels.

Who supplies water in S42?

S42 (North East Derbyshire) is supplied by Severn Trent. You can view their full profile and compliance data on our supplier page.

Is S42 water hard or soft?

No hardness reading has been published for S42 itself. Across the S postcode area the typical value is 88 mg/L CaCO3, which is classified as moderately soft. This is a moderate hardness level.

Should I use a water filter in S42?

S42 water scored 9.1/10 with no contaminants above recommended levels. A filter is optional but can improve taste, especially if you notice a chlorine flavour. See our filter recommendations for your area.

Are there PFAS forever chemicals in S42 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for S42, and the Environment Agency has no PFAS detections in rivers or groundwater within 10 km of it. That reflects where sampling has happened as much as the water itself.

How clean is the river near S42?

The Environment Agency rated the Redleadmill Brook as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae and phosphate. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants. This is a rating of the river, not of tap water in S42, which is treated before it reaches homes.

Keep reading

How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near S42

Environment Agency samples from rivers, groundwater and reservoirs nearby. Not your tap water. For scale they are shown against drinking water limits; rivers are judged against much stricter environmental standards, and on those every river in England fails for chemicals.

SubstanceReadingDrinking water limit
Ammonia0.49 mg/L0.5 mg/L
Iron0.558 mg/L0.2 mg/L
pH8.18 pHNone
Temperature9.7 °CNone
Conductivity191 µS/cmNone
Nitrate2.1 mg/L50 mg/L
Nitrite0.0049 mg/L0.5 mg/L
Phosphate0.019 mg/LNone
Dissolved Oxygen11.4 mg/LNone
Copper0.00179 mg/L2 mg/L
Zinc0.125 mg/LNone
Hardness (as CaCO3)480 mg/LNone

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We'll email you when water quality data changes for S42.

Source: Severn Trent test results, published through the Stream Water Data Portal; rivers and PFAS from the Environment Agency. Page updated . How we score · Where the data comes from